case 4670 multiple changes by Claude to break out message sending from the individual forms and support the trial server request

Program.cs

@@ -1,14 +1,17 @@
-using Microsoft.AspNetCore.Hosting;
-using Microsoft.Extensions.Hosting;
-
-namespace contact
-{
-    public class Program
-    {
-        public static void Main(string[] args) =>
-            Host.CreateDefaultBuilder(args)
-                .ConfigureWebHostDefaults(web => web.UseStartup<Startup>())
-                .Build()
-                .Run();
-    }
-}
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Hosting;
+
+namespace contact
+{
+    public class Program
+    {
+        //No UseUrls here. The listening address comes from ASPNETCORE_URLS in the systemd unit
+        //(http://127.0.0.1:3002) and from launchSettings.json for local runs.
+        //The old "only *:3002 works with nginx" comment was F1: nginx proxied to $server_addr, the public IP.
+        public static void Main(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(web => web.UseStartup<Startup>())
+                .Build()
+                .Run();
+    }
+}